Rafe Spall and Toby Jones are being eyed for roles in the 'Jurassic World' sequel.

Details of the upcoming blockbuster - which will see Chris Pratt and Bryce Dallas Howard return - are being kept tightly under wraps, but according to Variety, director Juan Antonio Bayona has offered mystery parts to the two actors, and is currently auditioning to fill other roles in the film.

While the sequel is being kept top secret, Colin Trevorrow, who co-wrote and directed 'Jurassic World' has revealed it will be "more suspenseful and scary" than the 2015 movie, and admitted Bayona was specifically brought in to offer his own unique skills to the project.

Trevorrow said: "It will be more suspenseful and scary.

"It's just the way it's designed; it's the way the story plays out. I knew I wanted Bayona to direct it long before anyone ever heard that was a possibility, so the whole thing was just built around his skill set."

Director Bayona recently revealed he would be working with a mammoth budget of $260 million - $110 million more than the reported $150 million cost of 'Jurassic World'.

What's more, the movie is said to have been given an official title, and while the 41-year-old filmmaker didn't give it away, he teased it would be revealed soon.

Spall will next be seen in 'Mum's List', which hits cinemas later this month, and Jones will be one of the villains on the upcoming series of 'Sherlock'.

Raptor wrangler Owen (Pratt) and his ex, Claire (Howard) return to Isla Nublar to rescue the dinosaurs from an impending volcanic eruption. Lots of ideas and some earnest lessons about conservation can’t hide that the franchise is running out of oomph, but it’s still fun.